JPH0256597B2 - - Google Patents

Abstract

PURPOSE:To prevent a spring from deteriorating, to unnecessitate replacing of the spring in a short period of time, to facilitate the maintenance of the heat exchanger and to eliminate a possibility of leakage of a fluid to be heated, by cooling the spring which applies an independent clamp pressure to a heat transfer tube by the low-temperature fluid to be heated. CONSTITUTION:An exhaust gas of a high temperature exhausted into the inner part of a frame body 1 is flowed, and air and other fluid to be heated of a low temperature are supplied into spaces 9, the fluid to be heated cools a spring 8 which is provided between one side wall surface component 4 of wall surface components 3 and 4 for clamping and holding a heat transfer tube 2, and a frame body 1, and applies an independent clamping force to each heat transfer tube 2. At the same time, the fluid to be heated is preheated by heat transmitted through the wall surface, and is introduced into a preheating chamber 10. The preheated fluid to be heated enters the heat transfer tube 2, and flows into a reversing chamber 13, flowing through the heat transfer tube 2 and being discharged to a heated fluid chamber 12. Meanwhile, each heat transfer tube 2 expands by the heat of the exhaust gas of a high temperature. However, since respective heat transfer tubes 2 are individually clamped and held by surface wall components 3 and 4 slidable in the axial direction, any leakage of the fluid to be heated is not produced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a shell-and-tube heat exchanger that can efficiently recover heat from high-temperature exhaust gas discharged from various industrial furnaces.

(Prior art) As a shell and tube type heat exchanger for recovering heat from high-temperature exhaust gas, the
As shown in Japanese Patent No. 51037, a system is known in which a large number of ceramic heat transfer tubes are supported by the elastic force of a spring through heat-resistant members inside a frame through which high-temperature exhaust gas flows.

(Problems to be Solved by the Invention) However, in such conventional heat exchangers, the heat of exhaust gas is transmitted to the springs and easily deteriorates the springs, so the springs have to be replaced in a short period of time, and the springs Due to the decrease in the elastic force of the tube, the fluid to be heated tends to leak from both ends of the heat transfer tube, resulting in problems such as a relatively low heat recovery efficiency. Therefore, there has been a need for a shell-and-tube heat exchanger that is easy to maintain and has high heat recovery efficiency.

(Means for Solving the Problems) The present invention was completed in order to solve the problems of the conventional art. The heat transfer tubes are arranged in parallel by being held under pressure by a number of wall structures that can slide in different directions, and a spring is provided between each wall structure and the frame on one side to apply independent pressure to each heat transfer tube. while connecting the space in which the spring is located to a source of cool heated fluid;
The present invention is characterized in that a preheating fluid chamber is provided on one side of the frame for allowing the fluid to be heated that has been preheated in the space to flow into the heat transfer tube.

Embodiments Next, the present invention will be explained in detail with reference to illustrated embodiments. 1 is a metal having openings on both upper and lower surfaces through which high-temperature exhaust gas discharged from various industrial furnaces flows. The frame body 2 is a large number of heat exchanger tubes arranged in parallel in the frame body 1 in a direction perpendicular to the exhaust gas flow direction. These heat exchanger tubes 2 are preferably made of ceramic tubes with excellent heat resistance and corrosion resistance, such as silicon carbide, and both ends of each heat exchanger tube 2 are provided with wall structures 3 and 4 that can be individually slid in the axial direction. They are each held under pressure. wall structure 3,
Reference numeral 4 is provided with a through hole that communicates with the heated fluid circulation hole 5 inside the heat transfer tube 2, and its outer peripheral surface is in close contact with the frame 1 as shown in the figure when stacked on top of each other.
It forms an airtight wall inside. The wall structure 3 on one side is supported by the side wall of the frame 1 via a tubular adapter 6, and the wall structure 4 on the other side is supported by the side wall of the frame 1 via a tubular adapter 6.
is supported on the opposite side wall of the frame 1 via a tubular adapter 7 as well. A coiled spring 8 is provided around the adapter 7, and can press the wall structure 4 to the left in the drawing to apply independent clamping force to each heat exchanger tube 2.
A space 9 formed between these wall structures 4 and the frame 1 in which a spring 8 is disposed is connected to a low-temperature heated fluid supply source, and when the low-temperature heated fluid passes through the space 9, While these springs 8 are cooled, the heated fluid itself is preheated. On the other hand, a preheating fluid chamber 10 is provided on one side of the frame 1, and the preheated fluid to be heated flows into the heat transfer tube 2. The fluid is sent to the preheating fluid chamber 10 and flows into the heat exchanger tube 2 via the adapter 6 and the wall structure 3, which penetrate the side wall of the frame 1 and communicate with the preheating chamber 10. However, in the case of a two-pass type heat exchanger as in this embodiment, about 40% of the heat exchanger tubes 2, which is the first pass, out of all the heat exchanger tubes 2.
The remaining heat transfer tubes 2, which are the second pass, are communicated with the heating fluid chamber 12 outside the preheating fluid chamber 10 through the longer adapter 6. There is. Further, an inversion chamber 13 is formed outside the space 9 in which the spring 8 of the frame body 1 is disposed, and all the heat exchanger tubes 2 are communicated with this inversion chamber 13 by the adapter 7 described above. Therefore, the fluid to be heated that has flowed into the first pass heat transfer tube 2 from the preheating fluid chamber 10 is heated and flows into the inversion chamber 13.
The heat exchanger passes through the adapter 7 and flows into the heat transfer tube 2 of the second pass, where it is further heated and discharged into the heated fluid chamber 12.

FIG. 2 shows a second embodiment of the present invention, in which a flow path 1 communicating a space 9 and a preheating fluid chamber 10 is shown.
1 are formed on the front and rear side walls of the frame 1.
FIG. 3 is an enlarged view of the peripheral part of the spring 8, and 17 is a bulge attached to the adapter 7;
4 is an annular packing, 15 is a gland packing that seals between the adapter 7 and the frame 1, and 16 is a packing presser that utilizes the elastic force of the spring 8.

(Function) The device configured as described above allows high-temperature exhaust gas discharged from various industrial furnaces to flow through the inside of the frame 1, and also allows air and other low-temperature heated fluids to flow through the space 9 from the heated fluid supply source. When the heated fluid is supplied to the wall structure 3 that holds the heat transfer tube 2 under pressure,
It cools the spring 8 which is provided between the wall structure 4 and the frame 1 on one side of the heat exchanger tube 4 and applies an independent clamping force to each heat transfer tube 2, and is itself constituted by the stacked wall structure 4. The flow path 1 is preheated by the heat transmitted from the high temperature exhaust gas through the wall surface.
1 to a preheating fluid chamber 10 provided on one side of the frame 1. As described above, the preheated fluid to be heated in the preheating fluid chamber 10 enters the first pass heat transfer tube 2 via the adapter 6 and the wall structure 3, and flows into the inversion chamber 13 via the wall structure 4 and the adapter 7. After that, it flows through the heat exchanger tube 2 of the second pass again and is discharged to the heated fluid chamber 12, but during this time, heat exchange is performed with the high temperature exhaust gas through the heat exchanger tube 2, and the heat amount of the exhaust gas is reduced. It can be fully recovered. During this time, each heat exchanger tube 2 expands due to the heat of the high-temperature exhaust gas, but each heat exchanger tube 2 is individually held under pressure by wall structures 3 and 4 that can individually slide in the axial direction on both sides. The expansion of the heat exchanger tube 2 is absorbed by the sliding of the wall structures 3 and 4 in the axial direction, and the spring 8 is cooled by the low-temperature heated fluid, so its elastic force does not deteriorate and is always stable. Since this squeezing force is applied between the heat transfer tube 2 and the wall structures 3 and 4, leakage of the fluid to be heated does not occur. In addition, wall structures 3 and 4
are stacked to form a wall inside the frame 1, so the spring 8, adapter 6, adapter 7, etc. are shielded from high-temperature exhaust gas by this wall, preventing deterioration due to heat and preventing high-temperature Leakage of exhaust gas to the outside is also prevented. In addition, the second
In the second embodiment shown in the figure, the heated fluid is preheated to a higher temperature while passing through a flow path 11 provided on the wall of the frame 1, and cools the frame 1.
This prevents heat dissipation from the frame body 1, and also extends the life of the frame body 1 and prevents danger.

(Effects of the Invention) As is clear from the above description, the present invention prevents deterioration of the spring by cooling the spring that applies an independent squeezing force to the heat transfer tube with a low-temperature heated fluid, so that the spring can be used for a short period of time. There is no need to replace the heat exchanger in between, maintenance is easy, there is no risk of leakage, and since the fluid to be heated is preheated during this time, an extremely high heat recovery efficiency can be obtained. Therefore, the present invention solves the problems of conventional heat exchangers, and is suitable for industrial use as a shell-and-tube type heat exchanger that can extremely efficiently recover heat from high-temperature exhaust gas from various industrial furnaces. The contribution it makes to the development of the world is extremely large.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of the present invention, FIG. 2 is a partially cutaway plan view showing the second embodiment, and FIG. 3 is an enlarged sectional view of the periphery of a spring. 1: Frame, 2: Heat exchanger tube, 3, 4: Wall structure,
8: Spring, 9: Space, 10: Preheating fluid chamber.

Claims (1)

[Scope of Claims] 1. A large number of heat exchanger tubes 2 are arranged in parallel in a frame 1 through which high-temperature exhaust gas flows, held under pressure between a number of wall structures 3 and 4 that can be individually slid in the axial direction. At the same time, springs 8 that apply independent clamping force to each heat transfer tube 2 are provided between each wall structure 4 and the frame 1 on one side, and a space 9 in which these springs 8 are arranged is used to supply a low-temperature heated fluid. while connecting to the source
A heat exchanger characterized in that a preheating fluid chamber 10 is provided on one side of the frame body 1 for causing the heated fluid preheated in the space 9 to flow into the heat transfer tubes 2. 2. The heat exchanger according to claim 1, wherein the preheating fluid chamber 10 is connected to the space 9 via a flow path 11 formed in the side wall of the frame body 1. 3. The heat exchanger according to claim 1 or 2, wherein the heat exchanger tubes 2 are ceramic tubes.